Program timeline
|
| 2001 |
Nisqually earthquake damages viaduct.
Viaduct and seawall replacement project begins.
|
| 2002 |
Conceptual engineering for replacement begins.
|
| 2003 |
Select environmental review alternatives.
|
| 2004 |
Release Draft Environmental Impact Statement with five alternatives.
State and city select cut-and-cover tunnel as preferred alternative.
|
| 2005 |
State and city refine cut-and-cover tunnel and elevated structure alternatives.
|
| 2006 |
Release Supplemental Draft Environmental Impact Statement with two alternatives.
|
| 2007 |
Seattle voters reject cut-and-cover tunnel and elevated alternatives.
Moving Forward projects (pdf 311 kb), located in the north and south ends of the viaduct, begin.
|
| 2007 - 2008 |
Repair viaduct columns between Columbia Street and Yesler Way.
|
| 2008 |
State, county and city, with input from the public, reexamine options for viaduct’s central waterfront section.
|
| 2008 - 2009 |
Relocate electrical lines from the viaduct's south end.
|
| 2008 - 2013 |
Transit enhancements and other improvements to keep people and goods moving during construction of the Moving Forward projects.
|
| 2009 |
Governor, County Executive and Mayor recommend replacing the viaduct's central waterfront section with a deep bored tunnel, new waterfront surface street, transit investments, and downtown city street and waterfront improvements.
State Legislature approves bored tunnel replacement funding.
|
| Ongoing until bored tunnel opens |
Maintain and repair the Battery Street Tunnel at the viaduct's north end.
|
| 2010 |
Begin construction to replace viaduct's south end between S. Holgate Street and S. King Street.
Release second Supplemental Draft Environmental Impact Statement.
|
| 2011 |
Release Final Environmental Impact Statement and issue Record of Decision.
Begin bored tunnel construction.
|
| 2013 |
New SR 99 segment between S. Holgate and S. King streets opens to drivers.
|
| 2015 |
Bored tunnel opens to drivers.
|
| 2016 |
Remove viaduct along central waterfront.
Begin Alaskan Way boulevard and waterfront promenade construction. |